Question

Consider a sphere passing through the origin and the points $(2,1,-1),(1,5,-4),(-2,4,-6)$. What is the centre of the sphere?

• A. $(-1,2,-3)$
• B. $(1,-2,3)$
• C. $(1,2,-3)$
• D. $(-1,-2,-3)$

Answer 1

The correct option is A $(-1,2,-3)$

Distance between the point $(1,1,1)$

So the centre of the sphere $(-1,2,-3)$